Title:
A personal digital assistant with electronic compass, and a direction calculating method
Document Type and Number:
Japanese Patent JP5958345
Kind Code:
B2
Abstract:
A mobile terminal with electronic compass is provided with a first housing that houses a geomagnetic sensor, a second housing connected to the first housing, with relative position thereto being variable, a state detection unit that detects a relative position state between the first housing and the second housing, an offset correction initial value storage unit that stores an offset correction initial value for each of a plurality of relative position states detected by the state detection unit, and an offset correction value determination unit that determines whether the offset correction value calculated by a calibration unit is valid or invalid. The offset correction value determination unit, in a case of determining that the offset correction value calculated by the calibration unit is valid, updates the offset correction value as the offset correction initial value corresponding to the relative position state, and stores the offset correction initial value in the offset correction initial value storage unit.
Inventors:
Yousuke Shinada
Application Number:
JP2012545789A
Publication Date:
July 27, 2016
Filing Date:
November 24, 2011
Export Citation:
Assignee:
NEC
International Classes:
G01C17/32; G01C17/38
Domestic Patent References:
| JP2009229062A | 2009-10-08 | |||
| JP2005207799A | 2005-08-04 | |||
| JP2005291932A | 2005-10-20 | |||
| JP2009229062A | 2009-10-08 | |||
| JP2005207799A | 2005-08-04 |
Attorney, Agent or Firm:
Kato Asamichi
Kiuchi Uchida
Mitsuru Aoki
Higuchi
Mikio Takahashi
Kiuchi Uchida
Mitsuru Aoki
Higuchi
Mikio Takahashi